A judgment must order payment of attorney fees and litigation expenses separately from an order for periodic payments of future damages. The attorney fees and expenses must be paid either in a lump sum or by periodic payments pursuant to an agreement entered into between the claimant and the claimant’s attorney. An agreement for the immediate lump-sum payment of that portion of the attorney fees incurred to recover future damages to be paid by periodic payments must be calculated on the basis of the present value of the future damages.